Minniedale Projects are writing a detailed Schedule of Works tender document for builder pricing. The scheme involves a single storey side extension in Woking, Surrey. We have specified the extension windows to match the existing house and are getting quotes for black thermal slimline aluminium windows. The clients want confidence in receiving competitive pricing for the work from local builders in order to make an informed decision on who to instruct. They also want financial confidence before starting the build, knowing that all elements of the project have been allowed for and no assumptions have been made by those quoting. This reduces the opportunity for the builder to charge variations during the build.